US3499187A - Extrusion screw as well as extrusion machines provided with a screw in accordance with or similar to the invention - Google Patents

Extrusion screw as well as extrusion machines provided with a screw in accordance with or similar to the invention Download PDF

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Publication number
US3499187A
US3499187A US645025A US3499187DA US3499187A US 3499187 A US3499187 A US 3499187A US 645025 A US645025 A US 645025A US 3499187D A US3499187D A US 3499187DA US 3499187 A US3499187 A US 3499187A
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United States
Prior art keywords
screw
extrusion
threading
shank
well
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Expired - Lifetime
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US645025A
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English (en)
Inventor
Raymond Cohen
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Individual
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/50—Details of extruders
    • B29C48/505—Screws
    • B29C48/62—Screws characterised by the shape of the thread channel, e.g. U-shaped
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion

Definitions

  • the invention relates to an extrusion screw, i.e., a screw itself which is placed inside a cylindrical body, this cylindrical body being provided with an extrusion orifice at one of its ends, and a filling orifice so that the material introduced through the filling orifice is moved by the screw, and extruded by the extrusion orifice or head.
  • Extrusion machines are already known comprising worms. They are called slubbers or extruders. They are single or multiple screw.
  • the role of the screw 1 is to forward the material introduced through the spout 2 along the body, which is provided with known heating means. During this travel, the material changes its state, and from a solid becomes pasty under the effect of the heat transmitted by the body and the shearing work of the screw. This enables the screw to force the material towards the end of the machine through the screw-plate which imparts to it its final appearance and shape.
  • the present invention has more particularly the object of remedyinng these disadvantages and relates, to this end, to an extrusion screw characterized in that the bottom of the threading is sloped towards the axis of the screw, in regard to the displacement direction of the material, which more particularly affords a better mixing of the material during its displacement and increasing the output of the screw.
  • the invention also relates to extrusion machines provided with one or more screws according or similar to the invention.
  • FIGURE 2 is a section of a method of embodiment of this screw
  • FIGURE 3 shows in diagrammatical manner, an extrusion machine according to the invention.
  • the extrusion screw 3 shown in the attached FIGURE 2 comprises a spiral threading 4, which is rotatively driven for moving the material in the direction of the arrow F.
  • This rotation is obtained by a driving member driving the end 3 of the screw.
  • This rotating drive will take place by means of a reducing unit, for example, with gears 16.
  • the shank of the screw has a general cone-shaped appearance, the means section of this shank increasing from the end 3 up to the end 3 placed close to the exit 5 from the cylindrical body 5.
  • This conicity is materialized by the angle B and defines the compression rate of the screw.
  • the threading 4 which comes into contact by its periphery with the cylindrical body 5, has a height that decreases from the end 3 of the screw towards the end 3
  • the bottom 6 of the thread ing of the screw formed by the shank of this screw is sloped towards the axis Y-Y of the screw in the advancing area F of the material, so as to form an acute angle A with the axis of this screw.
  • the material mass 7 will place itself in a spot where the depth of the threading is shallower, so that this mass will be wedged between the wall 6 of the bottom of the threading and the wall 5 of the cylindrical body.
  • the material mass will have a tendency to become sheared, i.e., drawn between the bottom 6 of the threading and the wall 5 of the body, during the rotation of this screw. Moreover, we see that this mixing action occurs right along the screw, from the introducing area for the material through the funnel 9 up to the last threading near to the aperture 5 of the extrusion head.
  • the mass 10 tends to place itself automatically in an area 10 which has a greater depth of threading, which reduces the wedging force of the material 10, and thus prevents its shearing.
  • the screw according to the invention can be e ployed for any material, because, whatever this material may be, there is always one side, i.e., threading depth, where it is efficaciously worked.
  • the material is worked over the entire length of the screw, owing to the wedging effect which occurs automatically, so that it reaches the exit in a worked condition,-i.e., in a mogeneous pasty state.
  • the motive power required is considerably less.
  • the screw breaks at its base at 13, this breaking coming from the mechanical break line that normally occurs at the junction.
  • the shank 1 of the screw with the base 1 at the area 13 which is the smallest diameter area of the screw
  • the shank of this screw is connected to the base 3 by an area 14 whose diameter is intermediate between the diameter of the base 3 and the minimum diameter found at 15 at the base of the first threading.
  • the screw according to the invention thus has an enhanced solidity, making the maximum use of the natural resilience of the material forming the screw.
  • the invention will obviously relate to extrusiomscrews comprising the characteristic described above, and this whatever the kind of screw, whether it has one or several stages, or that itcomprises-or not-areas of which the shank is cylindrical, while retaining the angle of slope that may be constant or progressively variableor notfor one and the same screw.
  • the invention will obviously relate to extrusion machines provided with the screw according to the invention, whether it refers to machines with one or mor screws, With or without removal of gas.
  • An extrusion device comprising a screw having a longitudinal aXis and a shank provided with thread means thereon including a plurality of threads, said screw having shank areas on at least part of its length, each shank area being situated between two consecutive of said threads, each shank area being individually sloped towards said axis in the direction of the advancing thread and with an upstream edge at the base of the upstream thread and a downstream edge at the base of the downstream thread in the advancing direction of said thread, the depth of the thread level with each upstream edge of a shank area being less than the depth of the thread level with the downstream edge of the shank area "which precedes it in the direction of the advancing thread.
  • An extrusion device including a hollow cylindrical body of very slightly greater diameter than said threading, said body having a material filling orifice and an extrusion orifice at the opposite end of said body so that said threading advances material from said filling orifice to said extrusion orifice with said sloped sections increasing the shearing ettect on material being worked upon.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
US645025A 1966-06-14 1967-06-09 Extrusion screw as well as extrusion machines provided with a screw in accordance with or similar to the invention Expired - Lifetime US3499187A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR65447A FR1483344A (fr) 1966-06-14 1966-06-14 Vis d'extrusion ainsi que les machines d'extrusion pourvues d'une vis conforme ou similaire à l'invention

Publications (1)

Publication Number Publication Date
US3499187A true US3499187A (en) 1970-03-10

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ID=8610924

Family Applications (1)

Application Number Title Priority Date Filing Date
US645025A Expired - Lifetime US3499187A (en) 1966-06-14 1967-06-09 Extrusion screw as well as extrusion machines provided with a screw in accordance with or similar to the invention

Country Status (9)

Country Link
US (1) US3499187A (fr)
AT (1) AT314191B (fr)
BE (1) BE699542A (fr)
CH (1) CH469553A (fr)
DE (1) DE1629728C3 (fr)
FR (1) FR1483344A (fr)
GB (1) GB1166754A (fr)
NL (1) NL150718B (fr)
SE (1) SE331355B (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3602950A (en) * 1968-01-19 1971-09-07 Eckert & Ziegler Gmbh Injection molding machine
JPS49146260U (fr) * 1973-04-20 1974-12-17
US4446094A (en) * 1982-09-23 1984-05-01 Welding Engineers, Inc. Apparatus and method for extracting fluid from an extruded material
EP0140986A2 (fr) * 1983-10-20 1985-05-15 Welding Engineers, Inc. Dispositif et procédé pour l'extraction de fluides d'un matériau extrudé

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1904884A (en) * 1933-04-18 royle
US2411971A (en) * 1943-03-10 1946-12-03 Hydraulic Dev Corp Inc Extrusion machine
US2443289A (en) * 1941-04-23 1948-06-15 Plax Corp Apparatus for shaping plastics by extrusion
US3123860A (en) * 1964-03-10 Extruder screw
US3145420A (en) * 1963-05-28 1964-08-25 Du Pont Apparatus for melt extruding fiberforming thermoplastic polymers

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1904884A (en) * 1933-04-18 royle
US3123860A (en) * 1964-03-10 Extruder screw
US2443289A (en) * 1941-04-23 1948-06-15 Plax Corp Apparatus for shaping plastics by extrusion
US2411971A (en) * 1943-03-10 1946-12-03 Hydraulic Dev Corp Inc Extrusion machine
US3145420A (en) * 1963-05-28 1964-08-25 Du Pont Apparatus for melt extruding fiberforming thermoplastic polymers

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3602950A (en) * 1968-01-19 1971-09-07 Eckert & Ziegler Gmbh Injection molding machine
JPS49146260U (fr) * 1973-04-20 1974-12-17
US4446094A (en) * 1982-09-23 1984-05-01 Welding Engineers, Inc. Apparatus and method for extracting fluid from an extruded material
EP0140986A2 (fr) * 1983-10-20 1985-05-15 Welding Engineers, Inc. Dispositif et procédé pour l'extraction de fluides d'un matériau extrudé
EP0140986A3 (en) * 1983-10-20 1986-03-19 Welding Engineers, Inc. Apparatus and method for extracting fluid from an extruded material

Also Published As

Publication number Publication date
BE699542A (fr) 1967-11-16
DE1629728C3 (de) 1978-07-27
FR1483344A (fr) 1967-06-02
NL6708216A (fr) 1967-12-15
NL150718B (nl) 1976-09-15
GB1166754A (en) 1969-10-08
DE1629728B2 (de) 1977-12-01
CH469553A (fr) 1969-03-15
DE1629728A1 (de) 1971-02-04
SE331355B (fr) 1970-12-21
AT314191B (de) 1974-03-25

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